package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取session
        //HttpSession session = request.getSession();
        //2.获取session中的用户
        //Object user = session.getAttribute("user");

        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        //2.从redis取用户
        if(StrUtil.isBlank(token)){
            return true;
        }
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        //3.判断用户是否存在
        if(userMap == null){
            //4.不存在拦截
            return true;
        }

        //5.将HashMap转化为DTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //6.存在保存信息
        UserHolder.saveUser(userDTO);

        //7.刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token , RedisConstants.LOGIN_USER_TTL , TimeUnit.SECONDS);

        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
